Generell informasjon Brønnbane navn 7/12-4 Type Formål Status Faktakart i nytt vindu Hovedområde Felt Funn EXPLORATION APPRAISAL SUSPENDED lenke NORTH SEA ULA 7/12-2 ULA Brønn navn 7/12-4 Seismisk lokalisering Boret i utvinningstillatelse 019 Boreoperatør Boretillatelse 183-L Boreinnretning Bore dager 93 BP Norway Limited U.A. NORSKALD Borestart 11.09.1977 Boreslutt 12.12.1977 Frigitt dato 12.12.1979 Publiseringsdato 06.01.2014 Opprinnelig formål Gjenåpnet Innhold Funnbrønnbane APPRAISAL NO OIL NO 1. nivå med hydrokarboner, alder LATE JURASSIC 1. nivå med hydrokarboner, formasjon Avstand, boredekk - midlere havflate Vanndybde ved midlere havflate ULA FM 25.0 71.0 Totalt målt dybde (MD) [m RKB] 3623.0 Totalt vertikalt dybde (TVD) [m RKB] Maks inklinasjon [ ] 1.9 Temperatur ved bunn av brønnbanen [ C] Eldste penetrerte alder Eldste penetrerte formasjon Geodetisk datum NS grader 3623.0 144 EARLY JURASSIC BRYNE FM ED50 57 5' 36.66'' N Side 1 av 8
ØV grader 2 51' 36.96'' E NS UTM 6327946.46 ØV UTM 491532.39 UTM sone 31 NPDID for brønnbanen 298 Brønnhistorie General Well 7/12-4 was drilled as an appraisal well on the Ula Field in the North Sea. The main objective was to evaluate the extent and hydrocarbon potential of the Late Jurassic sands in the south eastern flank of the structure. Operations and results Appraisal well 7/12-4 was spudded with the semi-submersible installation Nordskald on 11 September 1977 and drilled to TD at 3623 m in Early Jurassic sediments of the Bryne Formation. Operations proceeded without significant problem. The well was drilled with fresh water/gel down to 498 m and with lime/drispac mud from 498 m to TD. The target reservoir Ula Formation was encountered at 3445 m, while the underlying Bryne Formation came in at 3529 m. Net sand in the reservoir was 73 m with porosity from 10 to 23%, permeability from a few millidarcy to 1750 millidarcy, and water saturation from 5 to over 60%. The reservoir was oil-bearing with a possible OWC at 3551 m in the Bryne Formation based on disappearance of oil shows; however, drill stem tests showed that the producible contact between oil and water was between 3530 and 3536 m. Seven cores were cut from near top Ula Formation at 3447.5 m to 3556.7 m in the Bryne Formation. The recovery was 100% in core one to six and 96% in core seven. RFT fluid samples were taken at 3458 m (oil, emulsion and water), 3467 m (emulsion) and at 3528 m (water) The well was suspended on 12 December 1977 for possible use as a producer at a later stage. It is classified as an oil appraisal well. Testing Production tests were carried out on three reservoir intervals to establish the producible oil-water contact and to obtain reservoir properties of the Middle and Late Jurassic sands. DST 1 tested the intervals 3536 to 3540 m and 3550 to 3552 m. This test failed for mechanical reasons in the first attempt. The second attempt, DST 1B, produced 10 Sm3 water/day with no indication of hydrocarbons. This was the only test where the temperature gauge functioned correctly. The measured temperature was 141.1 deg C DST 2 tested the interval 3527 to 3530 m. This test produced 6 Sm3 oil/day from lowpermeable sands at the base of the reservoir. The oil density was 0.828 g/cm3. DST 3 tested the main reservoir from the intervals 3453 to 3460 m and 3463.5 to 3471.5 m. This test produced in the final flow 1110 Sm3 oil, 73624 Sm3 gas /day through a 32/64" choke. The separator GOR was 66 Sm3/Sm3 while the total GOR was 96 Sm3/Sm3. The oil density was 0.830 g/cm3 and the gas gravity was 0.754 (air = 1). Side 2 av 8
Borekaks i OD Borekaksprøve, topp dybde Borekaksprøve, bunn dybde 180.00 3621.00 Borekaksprøve tilgjengelig NO Borekjerner i OD Kjerneprøve nummer Kjerneprøve - topp dybde Kjerneprøve - bunn Kjerneprøve dybde dybde - enhet 1 3447.5 3465.8 [m ] 2 3465.8 3474.5 [m ] 3 3474.5 3491.5 [m ] 4 3492.5 3510.7 [m ] 5 3510.7 3519.7 [m ] 6 3519.7 3538.4 [m ] 7 3538.4 3556.7 [m ] Total kjerneprøve lengde 108.2 Kjerneprøve tilgjengelig YES Kjernebilder 3447-3452m 3452-3457m 3457-3462m 3462-3465m 3465-3470m 3470-3474m 3474-3479m 3479-3484m 3484-3489m 3489-3491m Side 3 av 8
3492-3495m 3495-3497m 3500-3503m 3503-3506m 3497-3501m 3506-3510m 3510-3515m 3515-3519m 3522-3525m 3525-3527m 3527-3530m 3519-3531m 3531-3536m 3536-3538m 3538-3543m 3543-3548m 3548-3553m 3553-3556m Palynolgiske preparater i OD Prøve dybde Dybde enhet Prøve type Laboratorie 3448.2 C HYDRO 3449.8 C HYDRO 3450.0 C HYDRO 3456.5 C HYDRO 3460.0 C HYDRO 3465.0 C HYDRO 3470.7 C HYDRO 3471.6 C HYDRO 3472.3 C HYDRO Side 4 av 8
3473.8 C HYDRO 3474.8 C HYDRO 3479.7 C HYDRO 3484.5 C HYDRO 3485.3 C HYDRO 3486.0 C HYDRO 3487.8 C HYDRO 3490.6 C HYDRO 3495.4 C HYDRO 3500.5 C HYDRO 3505.2 C HYDRO 3509.7 C HYDRO 3514.5 C HYDRO 3519.0 C HYDRO 3523.0 C HYDRO 3525.1 C HYDRO 3525.5 C HYDRO 3527.0 C HYDRO 3528.0 C HYDRO 3530.2 C HYDRO 3534.1 C HYDRO 3537.0 C HYDRO Litostratigrafi Top depth Lithostrat. unit 95 NORDLAND GP 1587 HORDALAND GP 2583 ROGALAND GP 2583 BALDER FM 2618 SELE FM 2672 LISTA FM 2704 MAUREEN FM 2737 SHETLAND GP 2737 EKOFISK FM 2899 TOR FM 3101 HOD FM 3145 CROMER KNOLL GP 3145 RØDBY FM 3350 VIKING GP Side 5 av 8
3350 MANDAL FM 3365 FARSUND FM 3445 VESTLAND GP 3445 ULA FM 3529 BRYNE FM Geokjemisk informasjon navn format størrelse [KB] 298_1 pdf 0.56 298_2 pdf 0.48 298_3 pdf 0.54 298_4 pdf 1.43 298_5 pdf 0.64 298_6 pdf 0.63 298_7 pdf 0.27 er - eldre OD WDSS rapporter og andre relaterte dokumenter navn format størrelse [KB] 298_01_WDSS_General_Information pdf 0.26 er - rapportert av utvinningstillatelsen (frigitt ihht til regelverk) navn format størrelse [KB] 298_7_12_4_Completion_log pdf 2.23 298_7_12_4_Drilling_Completion_report pdf 8.41 298_7_12_4_Geological_Completion_Report pdf 7.88 Borestrengtester (DST) Test nummer Fra dybde MD Til dybde MD Reduksjonsven til størrelse [mm] 1.0 3536 3552 0.0 2.0 3527 3530 0.0 3.0 3453 3472 12.4 Side 6 av 8
Test nummer Endelig avstengningstrykk [MPa] Endelig strømningstrykk [MPa] Bunnhullstrykk [MPa] Borehullstempera tur [ C] 1.0 141 2.0 3.0 Test nummer 1.0 Olje produksjon [Sm3/dag] Gass produksjon [Sm3/dag] Oljetetthet [g/cm3] 2.0 6 0.830 Gasstyngde rel. luft GOR [m3/m3 ] 3.0 1110 73624 0.830 1.000 96 Logger Type logg Topp dyp Bunn dyp for for logg logg CBL VDL 85 3589 CDM AP 3367 3621 DLL MSFL 3366 3619 FDC CNL 3366 3620 GR 95 480 ISF SONIC 480 3618 SRS 80 3618 Foringinsrør og formasjonsstyrketester Type utforing Utforing diam. [tommer] Utforing dybde Brønnbane diam. [tommer] Brønnbane dyp Slam egenvekt ekvivalent [g/cm3] Type formasjonstest CONDUCTOR 30 169.0 36 174.0 0.00 LOT SURF.COND. 20 492.0 26 498.0 0.00 LOT INTERM. 13 3/8 1678.0 17 1/2 1694.0 0.00 LOT INTERM. 9 5/8 3369.0 12 1/4 3373.0 0.00 LOT LINER 7 3620.0 8 1/2 3621.0 0.00 LOT Boreslam Side 7 av 8
Dybde Egenvekt, Viskositet, Flytegrense Type slam MD slam [g/cm3] slam [mpa.s] [Pa] 0 1.43 waterbased 498 1.06 waterbased 597 1.43 waterbased 1125 1.40 waterbased 1388 1.44 waterbased 1694 1.45 waterbased 2920 1.44 waterbased 3339 1.44 waterbased Dato, måling Side 8 av 8